[luatex] How to get a \mid binary relation that grows in LuaTeX

[Hans Hagen]

On 11/15/2017 3:53 PM, David Carlisle wrote:
> On 15 November 2017 at 14:16, Hans Hagen <pragma at wxs.nl> wrote:
> 
> Hans, thanks for the reply
> 
>> (3) the good news is that you can do this:
>>
>>      \left( a \Umiddle class 5 | b \right)
>>
>> Hans
>>
> 
> 
> Ooh that is news:-) (the luatex manual doesn't seem to mention a
> possibility of class here)

it's sort of an experiment ... which will probably stay ... so it can be 
revealed ...

> but why 5 (closing)? I'd have expected to specify 3 (relation) to get

these are internal classes which have more granularity

  0   ord
  1   op normal
  2   op limits
  3   op no limits
  4   bin
  5   rel
  6   open
  7   close
  8   punct
  9   inner
  10  under
  11  over
  12  vcenter

> symmetric spacing but that gives thinmuspace not thickmuspace (at
> least with luatex 1.04 as distributed with texlive)
Hans

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